<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .en {
        }
    </style>
    <script src="jquery-1.11.3.min.js"></script>
    <script>
        $(function () {
            $(".en").on("click", "i", function () {
                console.log("iiiii");
            });

            $(".en").html("<i>123</i>");
        });
    </script>
</head>
<body>
<div id="testdiv">
    <span class="en"></span>
</div>
</body>
</html>